Patent GB-759855-A (GB)
Title: Cationic condensation products of amphotenic character
IPC: C14C3/20
Filed: 1953-05-07
Abstract: Tanning or retanning agents are prepared by condensing a dihydroxydiaryl sulphone, with a primary or secondary non-aromatic amine and formaldehyde.  The sulphone may be derived from phenol, cresol or chloro-phenol, and may contain nitro groups but should be free from sulphonic acid groups.  Amines specified are dimethyl-, butyl-, ethanol- and diethanolamine, morpholine and piperidine.  The componnets may be reacted in any sequence.  The products dissolve in acid or alkali but are insoluble near the neutral point.  In examples (1) specified quantities of 4.41 dihydroxydiphenylsulphone, ethanolamine and formaldehyde are mixed and reacted.  The hydrochloride of the product is soluble in water in all proportions. With half the quantities of amine and formaldehyde the hydrochloride is soluble only in hot water.  (2) 4.41 Dihydroxydiphenylsulphone is mixed with formaldehyde and the mixture reacted with dimethylamine in various proportions giving products the salts of which are soluble in hot and/or cold water.  (3) (a) 4.41 Dihydroxydiphenylsulphone is reacted with morpholine and formaldehyde; (b) as in (a) with twice the quantity of methylol morpholine instead of morpholine.  (4) Crude cresol sulphone is reacted with ethanolamine and formaldehyde. (5) (a) Chlorophenol sulphone, morpholine and formaldehyde are reacted; (b) as in (a) but using dimethylamine instead of morpholine.  In general as many amine residues may be attached to the phenol sulphone molecule as there are active positions on the molecule by using appropriate molar proportions of amine and formaldehyde.ALSO:Tanning or retanning agents are prepared by condensing a dihydroxydiarylsulphone with a primary or secondary non-aromatic amine and formaldehyde.  The sulphone may be derived from phenol, cresol or chloro-phenol and may contain nitro groups but should be free from sulphonic acid groups.  Amines specified are dimethyl-, butyl-, ethanol- and diethanolamine, morpholine and piperidine. The components may be reacted in any sequence.  The products dissolve in acid or alkali but are insoluble near the neutral point.  In examples (1) specified quantities of 4.41-dihydroxydiphenylsulphone, ethanolamine and formaldehyde are mixed and reacted.  The hydrochloride of the product is soluble in water in all proportions. With half the quantities of amine and formaldehyde the hydrochloride is soluble only in hot water.  (2) 4.4-dihydroxydiphenylsulphone is mixed with formaldehyde and the mixture reacted with dimethylamine in various proportions giving products the salts of which are soluble in hot and/or cold water.  (3) (a) 4.41-dihydroxydiphenylsulphone is reacted with morpholine and formaldehyde; (b) as in (a) with twice the quantity of methylol morpholine instead of morpholine.  (4) Crude cresol sulphone is reacted with ethanolamine and formaldehyde.  (5) (a) chlorophenol sulphone, morpholine and formaldehyde are reacted; (b) as in (a) but using dimethylamine instead of morpholine.  In general, as many amine residues may be attached to the phenol sulphone molecule as there are active positions on the molecule by using appropriate molar proportions of amine and formaldehyde.